Comparison of MUF, FOT and LUF for various antennas during a low
sunspot (SSN10) using an AN/GRC-42 (400 watts).
Transitional frequencies every 2 MHz will be needed to maintain 24-
hour communication for 90 percent of the time.
Twelve frequencies should be available, anything less, reliability
will decrease.
A change in frequency at other than the time
indicated will vary. There will be times when fewer frequencies are
required. See page 121 for frequency bands to avoid.
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